This page explains how Xingang Huang (USATT# 84304)'s rating went from 1848 to 1821 at the ICC - Advanced League event from 7 Mar 2011. The links below take you to pages that describe various aspects of the rating processor.

The rating processor goes through 4 passes in order. The links take you to pages that provide detailed explanations of the calculations during each of the 4 passes.